
/**
 * 参考链接
 * 参考链接
 * koa2基于stream(流)进行文件上传和下载
 * https://www.cnblogs.com/tugenhua0707/p/10828869.html
 * 
 */

const Koa = require('koa')
const app = new Koa()
const views = require('koa-views')
const json = require('koa-json')
const onerror = require('koa-onerror')
const bodyparser = require('koa-bodyparser')
const logger = require('koa-logger')

const index = require('./routes/index')
const users = require('./routes/users')
const upload= require('./routes/upload')
const downloads= require('./routes/download')

const koaBody = require('koa-body')
const static= require('koa-static')

// error handler
onerror(app)

// middlewares
app.use(bodyparser({
  enableTypes:['json', 'form', 'text']
}))
app.use(json())
app.use(logger())
app.use(require('koa-static')(__dirname + '/public'))


// koa-body
app.use(koaBody({
  multipart:true,//支持文件上传
  formidable:{
    maxFieldsSize:300*1024*1024,//最大文件300M
    multipart:true,//是否支持 multipart-formdate 表单
  }
}));




app.use(views(__dirname + '/views', {
  extension: 'ejs'  
}))

// logger
app.use(async (ctx, next) => {
  const start = new Date()
  await next()
  const ms = new Date() - start
  console.log(`${ctx.method} ${ctx.url} - ${ms}ms`)
})

// routes
app.use(index.routes(), index.allowedMethods())
app.use(users.routes(), users.allowedMethods())
app.use(upload.routes(),upload.allowedMethods())
app.use(downloads.routes(),downloads.allowedMethods())

// error-handling
app.on('error', (err, ctx) => {
  console.error('server error', err, ctx)
});

module.exports = app
